“the factories owned by Americans and other Westerners in China will close ...”
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Close? Why in the world, would they close?
Americans and other Westerners do not “own” anything in China.
China will operate its factories - which it owns, whether foreigners participate or not.
We have GIVEN AWAY our factories.
China owns them now.
What good is a factory if no one can buy your products?
I have read postings here from folks who travel to China on business, about entire towns full of shoe factories (for example) that were closed/empty. I believe the context was over supply of production, but it would be the same with no customers. Those factories would close if the buyers of their products were reduced.
http://www.google.com/search?hl=en&q=American+made+shoes&btnG=Google+Search